Adds llvoicecallhandler.cpp
Enables the Group and Avatar Actions requiring the voice refactor.
Adds autoStartCallOnStartup, processAgentListUpdates, startCall, and endCall to LLIMMgr.
Gives llimpanel some LLIMModel functionality to see if a floater was opened with the intent of being a call.
Cleans up LLIMPanel with new functions from the voice refactor.
Cleans up llfloatergroupinfo, makes it an instance tracker... pretty much as nice as llfloateravatarinfo now ^*^
Adds notifications JoinGroupNoCost and JoinedTooManyGroups (added to our existing translations, of course)
Cleans up all around, placing groupactions around.
Touches up bits for avataractions
